64 lines
2.1 KiB
PL/PgSQL
64 lines
2.1 KiB
PL/PgSQL
--
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-- num_nulls()
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--
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SELECT num_nonnulls(NULL);
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SELECT num_nonnulls('1');
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SELECT num_nonnulls(NULL::text);
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SELECT num_nonnulls(NULL::text, NULL::int);
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SELECT num_nonnulls(1, 2, NULL::text, NULL::point, '', int8 '9', 1.0 / NULL);
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SELECT num_nonnulls(VARIADIC '{1,2,NULL,3}'::int[]);
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SELECT num_nonnulls(VARIADIC '{"1","2","3","4"}'::text[]);
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SELECT num_nonnulls(VARIADIC ARRAY(SELECT CASE WHEN i <> 40 THEN i END FROM generate_series(1, 100) i));
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SELECT num_nulls(NULL);
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SELECT num_nulls('1');
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SELECT num_nulls(NULL::text);
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SELECT num_nulls(NULL::text, NULL::int);
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SELECT num_nulls(1, 2, NULL::text, NULL::point, '', int8 '9', 1.0 / NULL);
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SELECT num_nulls(VARIADIC '{1,2,NULL,3}'::int[]);
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SELECT num_nulls(VARIADIC '{"1","2","3","4"}'::text[]);
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SELECT num_nulls(VARIADIC ARRAY(SELECT CASE WHEN i <> 40 THEN i END FROM generate_series(1, 100) i));
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-- special cases
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SELECT num_nonnulls(VARIADIC NULL::text[]);
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SELECT num_nonnulls(VARIADIC '{}'::int[]);
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SELECT num_nulls(VARIADIC NULL::text[]);
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SELECT num_nulls(VARIADIC '{}'::int[]);
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-- should fail, one or more arguments is required
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SELECT num_nonnulls();
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SELECT num_nulls();
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--
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-- Test adding a support function to a subject function
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--
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CREATE FUNCTION my_int_eq(int, int) RETURNS bool
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LANGUAGE internal STRICT IMMUTABLE PARALLEL SAFE
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AS $$int4eq$$;
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-- By default, planner does not think that's selective
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EXPLAIN (COSTS OFF)
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SELECT * FROM tenk1 a JOIN tenk1 b ON a.unique1 = b.unique1
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WHERE my_int_eq(a.unique2, 42);
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-- With support function that knows it's int4eq, we get a different plan
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ALTER FUNCTION my_int_eq(int, int) SUPPORT test_support_func;
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EXPLAIN (COSTS OFF)
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SELECT * FROM tenk1 a JOIN tenk1 b ON a.unique1 = b.unique1
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WHERE my_int_eq(a.unique2, 42);
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-- Also test non-default rowcount estimate
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CREATE FUNCTION my_gen_series(int, int) RETURNS SETOF integer
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LANGUAGE internal STRICT IMMUTABLE PARALLEL SAFE
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AS $$generate_series_int4$$
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SUPPORT test_support_func;
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EXPLAIN (COSTS OFF)
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SELECT * FROM tenk1 a JOIN my_gen_series(1,1000) g ON a.unique1 = g;
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EXPLAIN (COSTS OFF)
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SELECT * FROM tenk1 a JOIN my_gen_series(1,10) g ON a.unique1 = g;
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